WO2013064916A1

WO2013064916A1 - Wire positioning device

Info

Publication number: WO2013064916A1
Application number: PCT/IB2012/054137
Authority: WO
Inventors: Peter Schütz
Original assignee: Schleuniger Holding Ag
Priority date: 2011-11-02
Filing date: 2012-08-14
Publication date: 2013-05-10
Also published as: KR101824296B1; EP2590275B1; MX341245B; CA2853821A1; CN104025396A; ES2575158T3; IN2014DN03445A; RU2014121997A; MX2014005238A; JP6147267B2; PL2590275T3; KR20140087047A; PT2774227T; HUE035341T2; US20140283382A1; CN104025396B; BR112014010527A2; EP2774227A1; JP2014534593A; ES2656507T3

Abstract

The invention relates to a wire positioning device (1) for positioning an electrical wire (2) in a processing device, said wire positioning device comprising a wire guide (4) for receiving the electrical wire (2) and a lowering device (5),which is movable vertically in relation to a first longitudinal axis (45) of the wire (2) received in the wire guide (4), the lowering device (5) having a press piece (6), which is spring-loaded via at least one spring element (15) and is provided so as to be contacted against the wire guide (4), the at least one spring element (15) being arranged in a tube (16). The invention also relates to a method for lowering thin wires (2) and for positioning them in an oscillation-damped manner, wherein a wire positioning device (1) according to the invention or a processing device according to the invention are used.

Description

WIRE POSITIONING DEVICE

This application claims benefit of priority to prior U.S. provisional application no. 61/554,765 filed on November 2, 201 1 , and as a non-provisional thereof; this application also claims benefit of priority to prior European application no.

EP1 1 187480 filed on November 2, 201 1 ; the entireties of European application no. EP1 1 187480 and of U.S. application no. 61/554,765 are expressly incorporated herein by reference each in their entirety, for all intents and purposes, as if identically set forth in full herein.

The invention relates to a wire positioning device for positioning an electrical wire in a processing device according to the preamble of claim 1. The invention further relates to a processing device, comprising a processing station and a wire positioning device of this type. The invention further relates to a method for lowering thin wires and for positioning them in an oscillation-damped manner.

A device of this type and a method for lowering and positioning wires in a processing station, formed as a crimping station, of a processing device is described in the prior art of WO 2009/017653 A1 .

In the conventional prior art:

A pivoting gripper mounted movably on a carriage grasps the wire at the insulation close to a bared wire end and moves in front of the crimping station, where it positions the bared wire end, for example a conductive wire or a stranded wire, approximately 8 to 10 mm above the lower punch and above a contact element to be crimped. The crimping tool is then started. The plunger moves downward with momentum by a stroke of approximately 30 to 60 mm, contacts the upright gripper head in the manner of a hammer during the last 8 to 10 mm and presses downward the spring-loaded gripper with the wire. The wire is thus introduced into the crimping claw, without significant deflection, provided it has a sufficiently large wire cross- section, and the sheathed part of the wire and/or the bared part is/are crimped synchronously on the lower punch by the upper punch of the crimping tool via an insulation and/or strand claw. At the same time, the carrier strip is separated by a separating punch. Once crimping is complete, the crimping tool moves back up into its upper dead centre and the gripper likewise springs back. The spring travel of conventional grippers is approximately 16 mm.

Conventional wires fitted in cars (0.35 to 6 mm²) are relatively easy to handle, even though they deflect slightly and vibrate slightly when pressed downward with momentum. However, no considerable difficulties are encountered during the crimping process.

Very thin wires, for example measuring 0.13 mm² are being increasingly installed in cars, however. Even wires having a wire cross-section of 0.05 mm² are being considered. However, such thin wires can no longer be processed using conventional techniques.

Thin wires have additional insulation, which has high tensile strength because the insulation also has to withstand some of the tensile force. The thin conductive wire or the stranded wires of the thin wires continue to oscillate for a long time once introduced into the crimping claw when they are positioned using conventional grippers. The conductive wire or the stranded wire cannot be controlled and introduced reliably into the crimping claw of a contact element during the stroke motion of the crimping tool, and the conductive wire or stranded wire may become bent or buckled.

WO 2009/017653 A1 discloses a wire positioning device intended to overcome such a drawback. The wire positioning device is arranged on a base frame. The wire positioning device according to WO 2009/017653 A1 has a gripper and is mounted rotatably on a rotating plate. This moves the wire in the planes A, B and C. For vertical positioning, the gripper has cylindrical guide rods with teeth, which are connected to a gearwheel of a horizontally arranged driveshaft of a servomotor and convert the rotary motion into a vertical motion. The height and spacings can also be controlled, however, by a hydraulic or other drive means.

The crimping tool comprises a stationary anvil and movable crimp upper punch, which is moved vertically by a stroke of the crimping station. The servomotor of the wire positioning device moves the end of the wire, once it has been positioned above an electrical contact element arranged on the anvil, into the open insulation and/or strand claw of the contact element by lowering. The contact element is then crimped to the wire.

With a wire positioning device of this type, the wire can be lowered more slowly. However, synchronisation is extremely difficult because it cannot be easily controlled. In addition, an additional servomotor increases the cost of the wire positioning device considerably. A reduction in the lowering speed may then also have a negative effect on productivity.

To overcome these drawbacks, a device for lowering and positioning thin wires in a crimping station is known from WO 201 1/004272 A1 , said device having a press base frame having a drive, which moves a press carriage along a central axis with a speed variation similar to a sine curve from an upper dead centre to a lower dead centre and back, a central plunger which is arranged parallel to the central axis and is fixed at one end to a holder, via which the plunger is connected rigidly to the press carriage of the crimping station so that the press carriage and plunger move synchronously in a downward stroke, a separate gripper with a gripper head and at least one pair of gripper jaws, by means of which the gripper positions at least one wire end of a conductor in a crimping zone of a crimping tool arranged on the press carriage and having a crimping tool upper part and a crimping tool lower part in a defined pivot-in position for crimping with crimping claws of a contact element, wherein at least one leading lowering device, which actuates the gripper head in a leading position in relation to the downward stroke of the plunger and lowers it in a leading position with reduced speed and thus moves the wire end from the pivot-in position into a defined crimping position, is assigned to or coordinated with the central plunger. A drawback of the wire positioning device described in WO 201 1/004272 is the high level of structural complexity and the associated high production costs.

GB 2 021 988 A, referred to hereinafter as D1 , describes a processing device comprising a processing station and a wire positioning device, as shown in particular in figure 30 of D1 . The processing station comprises a head 606, which is movable vertically in relation to the longitudinal axis of a wire and has a cutting knife 630 and a crimping element 631 inter alia. The wire positioning device comprises upper and lower positioning elements 408, 409 ("wire gathering heads"), which are movable vertically in relation to the longitudinal axis of the wire. The positioning elements 408, 409 can be transferred into an open position and into a closed position, as is shown in figures 30 and 31 of D1 , wherein, in the closed position, the positioning elements 408, 409 engage in one another in such a way that they surround the wire so as to hold it in its position as it is cut and stripped (in particular see page 10, lines 55 to 124).

In contrast to the invention, the movable head 606 described in D1 and comprising the element 640 is part of the processing station. It is therefore not part of the wire positioning device, as is provided in the invention, since the movable head 606 has tools, such as the cutting knife 630 and the crimping element 631 , which process the wire for further use. The wire positioning device of D1 is, by contrast, formed by the positioning elements 408, 409 inter alia, which are then also to be compared to the lowering device according to the invention. If the positioning elements 408, 409 are compared to the lowering device according to the invention, the difference between D1 and the invention lies in the fact that the positioning elements 408, 409 are not designed in the form of a press piece within the meaning of the invention and also do not have a spring element arranged in a tube. By contrast, the positioning elements 408, 409 of D1 are moved into a closed position and into an open position in an unsprung manner. US 4 521 946 A - referred to hereinafter as D2 - describes a conveying system for wires 1 16 that have already been cut, wherein the cut wires 1 16 are transported between two mutually opposed belts 52, 54. In an embodiment of D2, as shown in figures 15, 16 and 17 of D2, the upper belt 52 is connected to a conveying means 1 12 and the lower belt 54 is connected to a separator 68. The wires 1 16 are split by means of the separator 68 and are forwarded to different processing stations (in particular see D2, column 6, lines 27 to 38). The separator 68 has a pneumatic cylinder 172 to move the separator 68 accordingly so that it can split the wires and separate them from one another (in particular see D2, column 6, lines 44 to 47). By contrast, a wire positioning device according to an embodiment of the invention comprises a lowering device with a press piece and a spring element arranged in a tube. This is not disclosed in D2.

Figures 15, 16 and 17 of D2 do not describe a wire positioning device within the meaning of the invention. By contrast, a completely different object compared to that to be achieved by the present invention, namely the separation of wires so that the separated wires can be fed to different processing stations, is pursued with the conveying system described in D2, and therefore the disclosure of D2 is in no way comparable with the subject matter of the invention and in particular is not comparable with the characterising feature of claim 1 of this application.

EP 0 813 271 A2 - referred to hereinafter as D3 - describes a device for producing a cable harness, in which connection elements 13a, 13b are arranged in a clamping and shifting unit 14 at the two ends 8, 10 of a wire 1. The wire 1 is clamped in two clamps 24a, 24b for this purpose, said clamps being driven by piston cylinders 25a, 25b (in particular see D3, column 5, lines 18 to 32). A wire positioning device comprising an embodiment of the invention is also not disclosed in D3, since D3 does not disclose a press piece and a lowering device having a spring element arranged in a tube.

The object of the present invention is therefore to create a solution by means of which the structural complexity of a wire positioning device and therefore of a processing device for an electrical wire can be reduced and by means of which selective positioning of an electrical wire in a processing station of a processing device can also be achieved.

A further object of the invention is to create a method which can be carried out in a cost effective manner and which, in particular, is suitable for the positioning of thin electrical wires.

These objects are achieved by the features of the independent claims. Advantageous developments are illustrated in the figures and disclosed in the dependent claims.

In accordance with the invention, the wire positioning device is characterised in that the lowering device has a press piece, which is spring-loaded by at least one spring element and is provided so as to be contacted against the wire guide, the at least one spring element being arranged in a tube. When a wire is supplied for the wire positioning device, the wire guide and the free end of the wire protruding from the wire guide are oscillated both in a direction horizontal to the longitudinal axis of the wire and in a direction vertical to the longitudinal axis of the wire due to the filigree structure of a thin wire and the resultant likewise relatively thin design of the wire guide, which may be embodied for example in the form of a thin guide tube, from which a free end of the wire, preferably a partially bared end of the wire, protrudes. This oscillatory movement of the wire guide together with the wire introduced therein can be interrupted by a lowering of the lowering device and by the resultant contact of the press piece of the lowering device against the wire guide. The press piece is applied directly to the wire guide as a result of a movement of the lowering device vertically in relation to the longitudinal axis of the wire received in the wire guide, in such a way that the press piece comes to rest against an upper face of the wire guide. The press piece preferably has a block or a plate, on which a flat contact surface is formed, by means of which the press piece is brought to rest against the wire guide when the lowering device is lowered. The press piece can also be formed as a hard rubber buffer, however, with a flat or slightly crowned contact surface. The press piece is mounted in the lowering device in a spring-loaded manner via at least one spring element, which is preferably embodied in the form of one or more compression springs, in such a way that the press piece can carry out a vertical movement in relation to the longitudinal axis of the electrical wire, guided by the spring element. The press piece can be connected to the spring element either directly or via an intermediate element, such as a pin. The press piece is therefore guided movably within the lowering device via the spring element, which is arranged in a tube, whereby, when the wire guide is positioned by contacting the press piece with the wire guide, the wire guide can initially be accelerated as smoothly as possible and, once a height of insertion desired for the processing, in the processing station, of the free end of the wire protruding from the wire guide has been reached, the oscillation of the wire guide and therefore of the free end, protruding from the wire guide, of the electrical wire received therein may be stopped. If the wire guide and the free end of the wire protruding from the wire guide is substantially free from oscillation, the free end of the wire is positioned in a highly accurate manner in the processing station, for example a crimping station, due to the fact that there is now no inherent movement of the free end of the wire. Due to the arrangement of the spring element in a tube, it is possible to position and guide the spring element within the lowering device in a precise manner. In particular, lateral tilting of the spring element, which is preferably embodied in the form of a spiral spring, is thus prevented. Due to the wire positioning device according to the invention, the wire may be positioned in a processing station of a processing device with a high level of repetition accuracy. By means of the spring-loaded press piece, the oscillations of the wire guide of the free end of the wire protruding from the wire guide may be reduced within a short period of time, and therefore the overall processing time of an electrical wire in a processing station of a processing device can be reduced, whereby processing can be carried out more economically.

The spring-loaded press piece thus replaces the servomotor or central plunger, with the highly complex leading lowering device, known from the prior art and has a substantially simpler design than these. Due to the relatively simple structural design of the device according to the invention, the production costs of a wire positioning device can also be reduced considerably compared to conventional wire positioning devices.

In accordance with a preferred embodiment of the wire positioning device, a stop element is arranged opposite the press piece, it being possible for the wire guide to be clamped in an oscillation-damped manner between the press piece and the stop element. The stop element is preferably positioned below the wire guide when the electrical wire is introduced into the processing station of the processing device, whereas the press piece of the lowering device is positioned above the wire guide so that the press piece and the stop element are basically opposite one another. When the press piece rests on an upper face of the wire guide, the wire guide, which is still oscillating, can be pressed downward by means of the press piece in the direction of the stop element until the wire guide lies directly or indirectly via its lower face on the stop element arranged below the press piece so that the wire guide is clamped between the press piece and the stop element in an oscillation-damped manner, whereby the oscillation of the wire guide and therefore also of the free end of the electrical wire protruding from the wire guide can be minimised or stopped particularly quickly and effectively. The repetition accuracy and the precision of the processing of the electrical wire received in the wire guide in the processing station of the processing device can thus be further improved.

Furthermore, the press piece of the lowering device is preferably arranged with a second longitudinal axis above the wire guide, and the stop element is preferably arranged with a third longitudinal axis below the wire guide, the press piece being arranged with the second longitudinal axis vertically in relation to the first longitudinal axis, and the stop element being arranged with the third longitudinal axis vertically in relation to the first longitudinal axis. It can thus be ensured that the press piece and the stop element each lie with the contact surfaces against the wire guide in a flat or slightly crowned manner to damp the oscillation of the wire guide, whereby oscillation of the wire guide is damped particularly quickly and effectively. It is further preferable for the second longitudinal axis of the press piece to be arranged offset in relation to the third longitudinal axis of the stop element along the first longitudinal axis of the electrical wire.

In accordance with a further advantageous embodiment of the wire positioning device, the tube has an outer thread, which engages in a holding element having an inner thread. An outer thread can be formed on the outer peripheral surface of the tube, in which a holding element provided with an inner thread can engage. The tube in which the spring element is arranged can thus be positioned and fixed on the holding element. In addition, the tube and therefore the spring element can be easily fixed to the holding element by hand and adjusted at the same time via the outer thread and the inner thread engaging therein, without the need for further tools for this purpose. The effort required to form the wire positioning device can thus be reduced further. For example, the holding element may have a flange and a sleeve, wherein the sleeve can be fixed at a through-opening formed in the flange, and an inner thread, in which the outer thread of the tube can engage, can be formed on the inner wall of the sleeve so that the tube can be guided through the sleeve and the through- opening formed in the flange. The holding element can then be fixed via the flange to the processing station of the processing device.

Furthermore, the wire positioning device preferably has a pivotably mounted pivoting conveyor, the wire guide being fixed to the pivotably mounted pivoting conveyor. The wire to be processed can be held and transported in the pivotably mounted pivoting conveyor for example, since the wire is clamped between conveyor belts or pressure rollers formed on the pivoting conveyor. Starting from the fixing of the electrical wire on the pivoting conveyor, the wire and in particular the free end of the wire can be guided through the wire guide, which is arranged on the pivoting conveyor. The pivoting conveyor enables lateral pivoting of the wire fixed in the pivoting conveyor and guided in the wire guide, in the direction of the processing station of the processing device in which the free end of the wire protruding from the wire guide is crimped for example. Furthermore, the invention is characterised by a processing device, in particular a crimping device, for an electrical wire, said processing device having a processing station and a wire positioning device according to one of claims 1 to 6. A processing device which has a wire positioning device according to the invention is characterised by a high level of positioning accuracy of the wire to be processed in the processing station of the processing device, wherein this can be achieved with a low level of structural complexity of the overall processing device. For example, if the processing device is a crimping device, a free end of the wire to be processed can be positioned with as little oscillation as possible in the processing station in crimping claws of a contact part provided in a crimping tool. The quality of the processing operation, in particular of the crimping operation, of a wire can thus be improved considerably, wherein the wire can also be processed within a relatively short period of time so that the wire can be processed in a highly economical manner.

The processing station preferably has a movable carriage, the lowering device of the wire positioning device preferably being arranged on the movable carriage. The movable carriage is preferably used so that part of the processing station of the processing device can be moved back and forth in a vertical direction. If the lowering device of the wire positioning device is arranged on the movable carriage, the movement of the lowering device vertical to the longitudinal axis of the wire received in the wire guide may be ensured by the movable carriage, and therefore additional aids, such as an additional drive on the lowering device itself, are not required to move the lowering device. The structural complexity of the processing device may thus be reduced further.

Furthermore, the stop element of the wire positioning device is fixed to a rigidly positioned carrier element of the processing station. In this case, 'rigidly positioned' means that the carrier element is arranged in the processing station in a non- displaceable or immobile manner. The stop element is preferably likewise arranged rigidly on the carrier element so that there can preferably be no relative displacement between the carrier element and the stop element. The stop element can thus form a secure, fixedly positioned counter pressure element for the press piece when the wire guide is pushed against the stop element by means of the press piece. Alternatively it is also possible, however, for the stop element to be movable vertically to the longitudinal axis of the wire received in the wire guide, similarly to the lowering device, so that the press piece and the stop element can be moved toward one another.

In accordance with the invention, the method is characterised in that a wire positioning device according to claims 1 to 6 and a processing device according to claims 7 to 10 are used.

In accordance with the method according to the invention, the lowering device is moved with the press piece from a first position into a second position. In the first position, the press piece is located above the upper face of the wire guide and distanced therefrom. The press piece has reached the second position as soon as it contacts the upper face of the wire guide, which leads to a first damping of the oscillation of the wire guide and of the wire. As the lowering device is lowered further, the press piece is moved vertically in the direction of the tube in accordance with the spring force of the spring element or of the individual spring elements, whilst the wire guide is moved with reduced acceleration by the press piece in the form of a pitch movement from the second position into a third position. The third position is reached as soon as the vertical movement of the lowering device and the pitch movement of the wire guide are concluded by contact with the stop element.

Further advantages, features and details of the invention will emerge from the following description, in which an exemplary embodiment of the invention is described with reference to the drawings. The features disclosed in the claims and in the description may be essential to the invention either individually or in any combination.

The list of reference signs forms part of the disclosure. The figures are described contiguously and comprehensively. Like reference signs denote like component parts, and reference signs having different indices denote functionally like or similar component parts.

In the figures:

Fig. 1 shows a schematic, partial sectional illustration of a processing device

having a wire positioning device according to the invention in a first position, Fig. 2 shows a schematic, partial sectional illustration of the processing device having a wire positioning device according to the invention in accordance with figure 1 in a second position,

Fig. 3 shows a schematic detailed illustration of the wire positioning device shown in figure 2 according to the invention in the second position, and

Fig. 4 shows a schematic detailed illustration of the wire positioning device

according to the invention in a third position.

Figures 1 and 2 show a processing device according to the invention, said device having a processing station 3 and a wire positioning device 1 for positioning an electrical wire 2 in the processing station 3. Figure 3 shows a detailed illustration of the wire positioning device 1 according to figure 2 in a second position, and figure 4 shows a detailed illustration of the wire positioning device 1 in a further, third position.

The processing station 3 shown in this case is formed as a crimping station, and therefore the processing device shown in this case is also a crimping device. The crimping station shown in this case has a crimping tool with an upper punch unit 39 and a lower punch unit 40. The invention is not limited to a crimping device having a crimping station, however. For example, it can also be used for soldering or welding devices.

The wire positioning device 1 has a wire guide 4, in which the electrical wire 2 is received so as to be processed in the processing station 3. The wire guide 4 is embodied in this case in the form of a guide sleeve, through which the wire 2 is guided, wherein a free end 44 of the wire 2 protrudes from the wire guide 4.

The wire positioning device 1 further has a lowering device 5, which is arranged movably vertically in relation to a first longitudinal axis 45 of the electrical wire 3 received in the wire guide 4.

The lowering device 5 has a spring-mounted press piece 6 at one end, which, in a second position as shown in figures 2 and 3, comes to rest against an upper face 7 of the wire guide 4. The press piece 6 shown in this case is basically T-shaped and has a plate 8 and a shaft 9 arranged on the plate 8, in particular as shown in figures 3 and 4. The plate 8 is a hard rubber buffer with a flat or slightly crowned surface. An outer thread 10 is formed on the shaft 9, via which the press piece 6 can be fixed. The press piece 6 shown in this case is thus embodied basically in the form of a screw. The press piece 6 has a preferably circular contact surface 1 1 on the plate 8, with which the press piece 6 can be pressed in a planar manner against the wire guide 4, as shown in figures 2, 3 and 4. In the embodiment shown in this instance, the press piece 6 is screwed in at a first end portion 12 of a pin 13 via the outer thread 10 formed on the shaft 9 and is fixed to the pin 13.

The pin 13 is connected to a spring element 15 at a second end portion 14 of the pin 13 opposite the first end portion 12, in such a way that the press piece 6 is spring- loaded via the pin 13. The spring element 15 is embodied in this case in the form of a plurality of compression springs arranged in succession. Alternatively, the spring element 15 may also be formed from a single mechanical compression spring. A small, pressurised pneumatic cylinder is also conceivable, as is a design with a press plunger guided in the tube and, for example, two outer tension springs mounted between the press plunger head and the assembly flange. The spring element 15 and the second end portion 14 of the pin 13 are arranged in a tube 16, wherein the longitudinal axis of the tube 16 extends vertically in relation to the longitudinal axis of the electrical wire 2.

The tube 16 is closed via a first cap-shaped end piece 17 and via a second cap- shaped end piece 18, wherein a through-opening 19 is formed in the second cap- shaped end piece 18, the first end portion 12 of the pin 13 being guided through said through-opening.

An outer thread 20 is formed on the outer peripheral surface of the tube 16. The tube 16 is fixed to a holding element 21 via the outer thread 20. The holding element 21 has an L-shaped, curved flange 22 and a cylindrical sleeve 23, for example for adjusting the height of introduction of the wire, wherein an inner thread 24 is formed on an inner wall of the sleeve 23 and the outer thread 20 of the tube 16 engages in said inner thread. The tube 16 is guided through a through-opening 25 formed in the flange 22. The sleeve 23, which can also be formed as a nut, is fitted on the flange 22 in the region of the through-opening 25 and is preferably fixed to the flange 22 so that the tube 16 is guided through the sleeve 23 and the through-opening 25 formed in the flange 22 and is screwed via its outer thread 20 into the inner thread 24 of the sleeve 23 so as to be fixed to the holding element 21 . The flange 22 and/or the holding element 21 preferably have at least two adjacent through-openings 25 so that the tube 16 can be installed at different locations.

The lowering device 5 is arranged via the flange 22 of the holding element 21 on a movable carriage 26 of the processing station 3 of the processing device and is fixed thereto via a screw 27. The movable carriage 26, which for example may be a press carriage, is movable in a direction 28 vertically in relation to the first longitudinal axis 45 of the wire 2 received in the wire guide 4. Since the lowering device 5 is fixed rigidly to the movable carriage 26, the lowering device 5 follows the movement of the movable carriage 26 so that the lowering device 5 is guided vertically by means of the movable carriage 26. It is therefore not necessary to provide separate drive means for the lowering device 5. The movable carriage 26 is moved via a crankshaft 29 arranged in the processing station 3 and via a crank pin 30 connecting the movable carriage 26 to the crankshaft 29.

A stop element 31 is arranged opposite the press piece 6, wherein the press piece 6 and the stop element 31 are arranged opposite one another in such a way that a second longitudinal axis 46 of the press piece 6 is oriented so as to be slightly offset in relation to a third longitudinal axis 47 of the stop element 31. The stop element 31 has a plate 32, which can be formed as a hard rubber buffer with a flat or slightly crowned surface, a dowel 33 screwed into the plate 32, and a flange 34, to which the dowel 33 is fixed by means of a fixing element 37. The stop element 31 has a planar contact surface 35 on its plate 32, the lower face 36 of the wire guide 4 coming to rest directly or indirectly against said contact surface when the wire guide 4 is pressed downward in the direction of the stop element 31 by means of the press piece 6, as shown in figures 2, 3 and 4. The lower face 36 of the wire guide 4 can be supported by a first support element 48, which is arranged on the pivoting conveyor 41 . In addition, a second support element 49 may be arranged on the pivoting conveyor 41 between the first support element 48 and the stop element 31 so as to further improve the stability of the pivoting conveyor 41. The stop element 31 is connected rigidly via the flange 34 to a carrier element 38 positioned rigidly on the processing station 3. The stop element 31 may alternatively also be mounted on the fixing surface of the machine, to which the press is also fixed.

The wire guide 4 is also fixed to a horizontally pivotably mounted pivoting conveyor 41 , via which the wire guide 4 is pivoted in the direction of the processing station 3, together with the wire 2 introduced into the wire guide 4, before the wire 2 is processed. The pivoting conveyor 41 has a pitch axis 42, about which the oscillation- damped pivoting conveyor 41 according to figure 3 introduces the wire 2 gently and in an oscillation-damped manner into an opened crimping claw of a contact element according to figure 4 mounted in a lower punch unit 40 of the processing station 3. Due to the reduced speed of the pivoting motion about the pitch axis 42 compared to the upper punch unit 39 as a result of the spring elements 15 and due to the spring assembly 43 arranged in the pivoting conveyor 41 , an oscillation of the wire guide 4 and of the free end 44 of the wire 2 protruding from the wire guide 4 is damped much quicker both in a vertical direction and in a horizontal direction compared to wire positioning devices of the prior art not having a lowering device.

Once the wire guide 4 has been pivoted in the direction of the processing station 3 together with the wire 2, the wire positioning device 1 is located in a first position, as shown in figure 1. In this first position, the press piece 6 and the stop element 31 are spaced from the wire guide 4. The free end 44 of the wire 2 protruding from the wire guide 4 oscillates freely in all directions as a result of the vibrations. So as to minimise the oscillatory movements of the wire guide 4 and of the free end 44 of the wire 2 protruding from the wire guide 4, the lowering device 5 is then moved downward in the direction of the wire guide 4 by the carriage 25 of the processing station 3 until the stop surface 1 1 of the press piece 6 rests against the upper face 7 of the wire guide 4 in accordance with figures 2 and 3 and has reached a second position. In this second position, a first damping of the oscillation of the wire guide 4 and of the wire 2 occurs. Whilst the carriage 25 and the lowering device 5 connected to the carriage 25 is lowered further vertically, the press piece 6 resting against the wire guide 4 is also accelerated smoothly in the direction of the stop element 31 and is moved downward into a third position by means of a pitch movement. Due to the developing spring effect of the spring elements 15 arranged in the lowering device 5, the lowering speed of the press piece 6 is reduced considerably, however, compared to the lowering speed of the carriage 25. At the same time, the oscillatory movements are damped further, until the lower face 36 of the wire guide 4 or, indirectly as illustrated in figure 4, a lower face of the second support element 49, lies against the contact surface 35 of the stop element 31 once the height of introduction of the wire set for the crimping process has been reached and once the third position has thus been reached, so that the wire guide 4 is clamped between the press piece 6 and the stop element 31 in the third position. The oscillations of the wire guide 4 and of the free end 44 of the wire 2 protruding from the wire guide 4 are now stopped. Subsequent oscillation of the pivoting conveyor 41 is therefore no longer possible. Once the pitch movement of the pivoting conveyor 41 is concluded, the free end 44 of the wire 2 is located, in accordance with figure 4, in a positionally precise and oscillation-damped manner in the opened crimping claw of a contact element provided in the lower punch unit 40 for crimping by means of the upper punch unit 39, in a manner known per se. The free end 44 of the wire 2 can be processed in a particularly precise and repetition-accurate manner due to the high level of positioning accuracy of the end 44 of the wire 2 in the processing station 3, said end of the wire now being substantially free from oscillation.

List of reference signs

1 wire positioning device 26 movable carriage

2 wire 27 screw

3 processing station 28 direction

4 wire guide 29 crankshaft

5 lowering device 30 crank pin

6 press piece 31 stop element

7 upper face 32 plate

8 plate 33 dowel

9 shaft 34 flange

10 outer thread 35 contact surface

1 1 contact surface 36 lower face

12 first end portion 37 fixing element

13 pin 38 carrier element

14 second end portion 39 upper punch unit

15 spring element 40 lower punch unit

16 tube 41 pivoting conveyor

17 first cap-shaped end piece 42 pitch axis

18 second cap-shaped end piece 43 spring assembly

19 through-opening 44 free end of the wire

20 outer thread 45 first longitudinal axis

21 holding element 46 second longitudinal axis

22 flange 47 third longitudinal axis

23 sleeve 48 first support element

24 inner thread 49 second support element

25 through-opening

Claims

A crimping device comprising a wire positioning device (1 ) for positioning a free end of an electrical wire (2) between an upper punch and a lower punch of a crimping tool of the crimping device, comprising a wire guide (4) for receiving the electrical wire (2) and a lowering device (5), which is movable vertically in relation to an axial plane of the first longitudinal axis (45) of the wire (2) received in the wire guide (4) or is movable from above toward the wire guide, characterised in that the lowering device (5) has a press piece (6), which is spring-loaded via at least one spring element (15), which is effective in the vertical direction, for pressing against the wire guide (4) so as to lower it in the operating state with the wire (2) so that the free end of the wire (2) can be brought closer to the lower punch, a stop element (31 ) being arranged opposite the press piece (6) and stopping the lowering movement of the lowering device (5) and of the wire guide (4) and of the wire (2) during a lowering operation, after a specific lowering path.

The crimping device according to claim 1 , characterised in that the wire guide (4) is mounted so it can be clamped in an oscillation-damped manner between the press piece (6) and the stop element (31 ), either directly or indirectly via support elements (48, 49).

The crimping device according to claim 1 or 2, characterised in that the press piece (6) of the lowering device (5) is arranged with a second longitudinal axis (46) above the wire guide (4), and the stop element (31 ) is arranged with a third longitudinal axis (47) below the wire guide (4), the press piece (6) being arranged with the second longitudinal axis (46) vertically in relation to the first longitudinal axis (45) of the wire (2), and the stop element (31 ) being arranged with the third longitudinal axis (47) vertically in relation to the first longitudinal axis (45) of the wire (2).

The crimping device according to claim 3, characterised in that the second longitudinal axis (46) of the press piece (6) is arranged offset in relation to the third longitudinal axis (47) of the stop element (31 ) along the first longitudinal axis (45) of the electrical wire (2).

5. The crimping device according to one of claims 1 to 4, characterised in that the at least one spring element (15) is arranged in a tube (16), the tube (16) preferably having an outer thread (20), which engages in a holding element (21 ) having an inner thread (24) or one of a plurality of inner threads (24).

6. The crimping device according to one of claims 1 to 5, characterised in that a pivotably mounted pivoting conveyor (41 ) with a pitch axis (42) is provided, the wire guide (4) being fixed to the pivotably mounted pivoting conveyor (41 ).

7. The crimping device according to one of the preceding claims for electrical wires (2).

8. The crimping device according to one of the preceding claims, characterised in that it has a movable carriage (26), the lowering device (5) of the wire positioning device (1 ) being arranged on the movable carriage (26).

9. The crimping device according to claim 7 or 8, characterised in that the stop element (31 ) of the wire positioning device (1 ) is fixed to a rigidly positioned carrier element (38) of the processing station (3).

10. A method for lowering a free end of a thin wire (2) and for positioning said free end of a thin wire in an oscillation-damped manner between an upper and a lower crimping punch, characterised in that a wire positioning device (1 ) according to one of the preceding clams is used.

1 1 . The method according to claim 10, characterised in that the lowering device (5) is moved with the press piece (6) from a first position into a second position, the press piece (6) having reached the second position as soon as it contacts the upper face (7) of the wire guide (4), which leads to a first damping of the oscillation of the wire guide (4) and of the wire (2), and

in that, as the lowering device (5) is lowered further, the press piece (6) is moved vertically in the direction of the tube (16) in accordance with the spring force of the spring element or of the individual spring elements (15), whilst the wire guide

(4) moves in the form of a pitch movement into a third position, with reduced acceleration due to the spring element(s) (15).

12. The method according to claim 1 1 , characterised in that the third position is reached as soon as the vertical movement of the lowering device (5) and the pitch movement of the wire guide (4) are concluded by contact with the stop element (5).

13. A wire positioning device (1 ) for positioning an electrical wire (2) in a processing device, said wire positioning device comprising a wire guide (4) for receiving the electrical wire (2) and a lowering device (5), which is movable vertically in relation to a first longitudinal axis (45) of the wire (2) received in the wire guide (4), characterised in that the lowering device (5) has a press piece (6), which is spring-loaded via at least one spring element (15) and is provided so as to be contacted against the wire guide (4), the at least one spring element (15) being arranged in a tube (16). 14. The wire positioning device (1 ) according to claim 13, characterised in that a stop element (31 ) is arranged opposite the press piece (6), the wire guide (4) being mounted so it can be clamped in an oscillation-damped manner between the press piece (6) and the stop element (31 ), either directly or indirectly via support elements (48, 49).

The wire positioning device (1 ) according to claim 14, characterised in that the press piece (6) of the lowering device (5) is arranged with a second longitudinal axis (46) above the wire guide (4), and the stop element (31 ) is arranged with a third longitudinal axis (47) below the wire guide (4), the press piece (6) being arranged with the second longitudinal axis (46) vertically in relation to the first longitudinal axis (45) of the wire (2), and the stop element (31 ) being arranged with the third longitudinal axis (47) vertically in relation to the first longitudinal axis (45) of the wire (2).

16. The wire positioning device (1 ) according to claim 15, characterised in that the second longitudinal axis (46) of the press piece (6) is arranged offset in relation to the third longitudinal axis (47) of the stop element (31 ) along the first longitudinal axis (45) of the electrical wire (2).

17. The wire positioning device (1 ) according to one of claims 13 to 16,

characterised in that the tube (16) has an outer thread (20), which engages in a holding element (21 ) having an inner thread (24).

18. The wire positioning device (1 ) according to one of claims 13 to 17,

characterised in that a pivotably mounted pivoting conveyor (41 ) with a pitch axis (42) is provided, the wire guide (4) being fixed to the pivotably mounted pivoting conveyor (41 ). 19. A processing device, in particular a crimping device, for an electrical wire (2), said device comprising a processing station (3) and a wire positioning device (1 ) according to one of claims 13 to 18.

20. The processing device according to claim 19, characterised in that the

processing station (3) has a movable carriage (26), the lowering device (5) of the wire positioning device (1 ) being arranged on the movable carriage (26).

21 . The processing device according to claim 19 or 20, characterised in that the stop element (31 ) of the wire positioning device (1 ) is fixed to a rigidly positioned carrier element (38) of the processing station (3).

22. A method for lowering thin wires (2) and for positioning them in an oscillation- damped manner, characterised in that a wire positioning device (1 ) according to claims 13 to 18 or a processing device according to claims 19 to 21 is used.

23. A method according to claim 22, characterised in that the lowering device (5) is moved with the press piece (6) from a first position into a second position, the press piece (6) having reached the second position as soon as it contacts the upper face (7) of the wire guide (4), which leads to a first damping of the oscillation of the wire guide (4) and of the wire (2), and

in that, as the lowering device (5) is lowered further, the press piece (6) is moved vertically in the direction of the tube (16) in accordance with the spring force of the spring element or of the individual spring elements (15), whilst the wire guide (4) moves with reduced acceleration in the form of a pitch movement into a third position.

24. The method according to claim 23, characterised in that the third position is reached as soon as the vertical movement of the lowering device (5) and the pitch movement of the wire guide (4) are concluded by contact with the stop element (5).

25. A wire crimping machine comprising:

a crimping tool, said crimping tool including an upper punch, said crimping tool including a lower punch;

a wire guide, said wire guide having a wire path configured to receive and guide wire ends to between said upper and lower punches;

a lowering unit configured to move relative to the axis of said wire path towards said wire path;

a press piece operatively connected to said lowering unit;

said lowering unit having a spring configured to bias said press piece towards said wire guide; and,

a stop configured to stop press piece induced movement of said wire guide, said stop situated in opposition to said press piece.

26. A wire crimping machine as claimed in claim 25, further comprising:

a mounting for said wire guide, said mounting situating said wire guide to be clamped in an oscillation-damped manner between said press piece and said stop.

27. The wire crimping machine as claimed in claim 25, wherein:

said press piece has its longitudinal axis offset relative to a longitudinal axis of said stop.

28. A wire crimping machine as claimed in claim 25, further comprising:

said lowering unit including a tube, said spring being in said tube;

an outer thread around at least a portion of said tube; and,

a holding element in which said outer thread engages.

29. A wire crimping machine as claimed in claim 25, further comprising:

a pivoting conveyor, said wire guide being fixed to said pivoting conveyor. 30. A wire crimping machine as claimed in claim 25, further comprising:

a movable carriage, said lowering unit being arranged on said movable carriage.

31 . A wire crimping machine as claimed in claim 25, further comprising:

a rigidly positioned carrier, said stop being fixed to said rigidly positioned carrier.

32. A wire positioning device comprising:

a wire guide, said wire guide having a wire path configured to receive and guide wire;

a lowering unit configured to move relative to the axis of said wire path;

5 a press piece operatively connected to said lowering unit;

said lowering unit including a tube; and,

a spring in said tube, said spring configured to bias said press piece towards said wire guide. o 33. A wire positioning device as claimed in claim 32, further comprising:

a stop situated in opposition to said press piece, said wire guide being mounted to be clamped in an oscillation-damped manner between said press piece and said stop.

5 34. The wire positioning device as claimed in claim 32, wherein:

35. A wire positioning device as claimed in claim 32, further comprising:

said lowering unit including a tube, said spring being in said tube;

an outer thread around at least a portion of said tube; and,

a holding element in which said outer thread engages.

36. A wire positioning device as claimed in claim 32, further comprising:

a pivoting conveyor, said wire guide being fixed to said pivoting conveyor.

37. A process for wire processing comprising steps of:

moving a lowering unit with a press piece from a first position to a second position;

defining the second position when the press piece first contacts an upper surface of a wire guide;

producing a first damping of wire guide oscillations at the second position;

further lowering the lowering unit thereby moving the press piece vertically in the direction of a tube of the lowering unit and under bias of a spring; and,

moving the wire guide in a pitch movement into a third position.

38. A process for wire processing as claimed in claim 37, further comprising the step of:

reaching the third position when vertical movement of the lowering unit concludes by contact with a stop.

39. A process for wire processing as claimed in claim 38, further comprising the step of:

positioning a wire free end in an oscillation damped manner between upper and lower crimping punches.